Bug #79905 [Opn]: fopen() read-only streams in write mode doesn't fail
Edit report at https://bugs.php.net/bug.php?id=79905&edit=1
ID: 79905
Updated by: cmb@php.net
Reported by: chokolatrix at gmail dot com
Summary: fopen() read-only streams in write mode doesn't fail
Status: Open
Type: Bug
Package: Filesystem function related
Operating System: WINDOWS
PHP Version: 7.4.8
Block user comment: N
Private report: N
New Comment:
The fact that opening the 'output', 'input', 'stdin',
'stderr' and
'fd' protocols completly ignores the given $mode[1], looks
actually wrong to me.
However, on Windows with IIS *F*CGI there is usually no stderr
(nor stdout for that matter); all communication with the Webserver
is done through a pipe. The fact that PHP allows to open
php://stderr is certainly a bug in this case.
[1] <https://github.com/php/php-src/blob/php-7.4.8/ext/standard/php_fopen_wrapper.c#L215-L341>
Previous Comments:
------------------------------------------------------------------------
[2020-07-28 12:08:30] chokolatrix at gmail dot com
Related: https://bugs.php.net/bug.php?id=79166
------------------------------------------------------------------------
[2020-07-28 11:37:04] chokolatrix at gmail dot com
Description:
------------
PHP's fopen() should fail to:
- open read-only streams in write mode (STDIO in 'w' or other write modes)
- open write-only streams in read mode (STDOUT, STDERR etc. in 'r' or other read modes)
This was noticed because of Laravel's logging to stderr failing under Apache/2.4.29 (Win64)
mod_fcgid/2.3.9 and PHP 7.4.8 x64 NTS.
There is possibly a bug with Apache and FastCGI exposing STDERR as non-writable (normally writes
STDERR to the error log), but Laravel logging code checks fopen() result being a stream before
writing to it.
Test script:
---------------
<?php
# c:\my-site\test.php
error_reporting(E_ALL);
ini_set('display_errors','On');
$fp = fopen('php://stdin', 'w');
var_dump($fp);
$fp = fopen('php://stderr', 'r');
var_dump($fp);
if ($fp) {
// this then fails on Apache + FastCGI - might be an Apache + FCGI bug causing stderr not to be
writable
fwrite($fp, "test");
}
Expected result:
----------------
bool(false)
bool(false)
Actual result:
--------------
Notice: fwrite(): write of 4 bytes failed with errno=9 Bad file descriptor in test.php on line 7
resource(3) of type (stream)
resource(4) of type (stream)
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Edit this bug report at https://bugs.php.net/bug.php?id=79905&edit=1
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